Mission-Long Recalibrated Science Quality Suomi NPP VIIRS Radiometric Dataset Using Advanced Algorithms for Time Series Studies

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Mission-Long Recalibrated Science Quality Suomi NPP VIIRS Radiometric Dataset Using Advanced Algorithms for Time Series Studies remote sensing Article Mission-Long Recalibrated Science Quality Suomi NPP VIIRS Radiometric Dataset Using Advanced Algorithms for Time Series Studies Changyong Cao 1,* , Bin Zhang 2, Xi Shao 2, Wenhui Wang 2 , Sirish Uprety 2, Taeyoung Choi 3, Slawomir Blonski 3 , Yalong Gu 3, Yan Bai 2, Lin Lin 2 and Satya Kalluri 1 1 NOAA/NESDIS/Center for Satellite Applications and Research, College Park, MD 20740, USA; [email protected] 2 Cooperative Institute for Satellite Earth System Studies (CISESS), University of Maryland/CISESS, College Park, MD 20740, USA; [email protected] (B.Z.); [email protected] (X.S.); [email protected] (W.W.); [email protected] (S.U.); [email protected] (Y.B.); [email protected] (L.L.) 3 Global Science and Technology, College Park, MD 20740, USA; [email protected] (T.C.); [email protected] (S.B.); [email protected] (Y.G.) * Correspondence: [email protected]; Tel.: +1-301-683-3600 Abstract: Suomi NPP has been successfully operating since its launch on 28 October 2011. As one of the major payloads, along with microwave and infrared sounders (Advanced Technology Microwave Sounder (ATMS), Cross-track Infrared Sounder (CrIS)), and ozone mapping/profiling (OMPS) instruments, the Visible Infrared Imaging Radiometer Suite (VIIRS) has performed for well beyond its mission design life. Its data have been used for a variety of applications for nearly 30 environmental data products, including global imagery twice daily with 375 and 750 m resolutions, Citation: Cao, C.; Zhang, B.; Shao, X.; clouds, aerosol, cryosphere, ocean color and sea-surface temperature, a number of land products Wang, W.; Uprety, S.; Choi, T.; Blonski, (vegetation, land-cover, fire and others), and geophysical and social economic studies with nightlights. S.; Gu, Y.; Bai, Y.; Lin, L.; et al. During the early days of VIIRS operational calibration and data production, there were inconsistencies Mission-Long Recalibrated Science in both algorithms and calibration inputs, for several reasons. While these inconsistencies have less Quality Suomi NPP VIIRS impact on nowcasting and near real-time applications, they introduce challenges for time series Radiometric Dataset Using Advanced analysis due to calibration artifacts. To address this issue, we developed a comprehensive algorithm, Algorithms for Time Series Studies. and recalibrated and reprocessed the Suomi NPP VIIRS radiometric data that have been produced Remote Sens. 2021, 13, 1075. https:// doi.org/10.3390/rs13061075 since the launch. In the recalibration, we resolved inconsistencies in the processing algorithms, terrain correction, straylight correction, and anomalies in the thermal bands. To improve the stability Academic Editor: Yuyu Zhou of the reflective solar bands, we developed a Kalman filtering model to incorporate onboard solar, lunar, desert site, inter-satellite calibration, and a deep convective cloud calibration methodology. Received: 10 February 2021 We further developed and implemented the Solar Diffuser Surface Roughness Rayleigh Scattering Accepted: 9 March 2021 model to account for the sensor responsivity degradation in the near infrared bands. The recalibrated Published: 12 March 2021 dataset was validated using vicarious sites and alternative methods, and compared with independent processing from other organizations. The recalibrated radiometric dataset (namely, the level 1b or Publisher’s Note: MDPI stays neutral sensor data records) also incorporates a bias correction for the reflective solar bands, which not only with regard to jurisdictional claims in addresses known calibration biases, but also allows alternative calibrations to be applied if so desired. published maps and institutional affil- The recalibrated data have been proven to be of high quality, with much improved stability (better iations. than 0.3%) and accuracy (by up to 2%). The recalibrated radiance data are now available from 2012 to 2020 for users and will eventually be archived on the NOAA CLASS database. Keywords: Suomi NPP VIIRS recalibration; viirs reprocessing; radiometric consistency; radiometric Copyright: © 2021 by the authors. stability; accuracy; Kalman filtering; SRRS model; WUCD; DNB reprocessing; VIIRS reprocessing system Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons 1. Introduction Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ Suomi NPP has been operating successfully since its launch on 28 October 2011. 4.0/). VIIRS is one of the major payloads, along with Advanced Technology Microwave Sounder Remote Sens. 2021, 13, 1075. https://doi.org/10.3390/rs13061075 https://www.mdpi.com/journal/remotesensing Remote Sens. 2021, 13, 1075 2 of 35 (ATMS), Cross-track Infrared Sounder (CrIS), and Ozone Mapping/Profiling (OMPS) instruments. VIIRS data have been used for a variety of applications including nearly 30 environmental data products [1] such as global imagery twice daily with 375 and 750 m resolution, cloud properties, aerosol, cryosphere, ocean color, sea-surface temperature, a number of land products (vegetation, land-cover, fire and others), as well as nighttime products for geophysical (nighttime aerosols, air glow) and social economic studies (light outage, correlation with gross domestic product). However, in the early days of VIIRS operational calibration and data production, there were inconsistencies in both algorithms and calibration inputs, for several reasons. This is further entangled with the unexpected rapid telescope mirror throughput degradation due to prelaunch contamination with tungsten oxide [2], for which several measures were implemented to mitigate its impacts on calibration, including the implementation of the RSBAutocal in the operations [3]. In addition, the Suomi NPP VIIRS reflective solar band calibration in the operations uses an outdated solar irradiance model [4], which becomes inconsistent with the later NOAA-20 calibration, which uses the Thuillier 2003 solar irradiance model [5]. Among the VIIRS radiometric performance requirements, the absolute radiometric accuracy for the reflective solar bands is specified as +/−2% (1 sigma), which is in line with that of the MODIS [6,7]. Separately, there is also the stability requirement, which states: “The VIIRS instrument response to input radiance shall not change by more than 0.1% for the emissive bands and 0.3% for the reflective bands during the time between successive acquisitions of on-orbit calibration data.” [8]. The above VIIRS calibration requirements are derived from the Key Performance Parameters (KPPs) requirements. KPPs are system attributes that represent those minimum capabilities or characteristics considered most essential to achieve an effective system. Failure to meet a KPP attribute threshold may result in a reevaluation of the program. The KPPs for VIIRS are: For latitudes greater than 60◦N in the Alaskan region, VIIRS Imagery EDRs at 0.64 µm (I1), 1.61 µm (I3), 3.74 µm (I4), 11.45 µm (I5), 8.55 µm (M14), 10.763 µm (M15), 12.03 µm (M16), and the 0.7 µm (DNB) Near-Constant Contrast (NCC) EDR [9]. However, these requirements were written from an operational product generation perspective, which relies heavily on operational forecasting and modeling for weather and ocean. In reality, the retrieval of several environmental products requires much more stringent calibration stability and absolute accuracy. For example, ocean color, aerosol, and vegetation require time series analysis with several months or years of extremely stable data in order to detect changes or anomalies. These types of studies use very sensitive algorithms with historical data and look for subtle changes in the time series or climatology. In addition, the stability and accuracy requirements for climate change studies are even more challenging [10], and this has led to the dedicated satellite missions of Climate Absolute Radiance and Refractivity Observatory (CLARREO) and TRUTH [11–13]. Therefore, calibration stability and accuracy are critical for these types of studies. From this perspective, the inconsistencies and artifacts in the operational Suomi NPP VIIRS data significantly impact their use. Thus, there is a fundamental need for recalibration. To address these issues, we have studied all relevant algorithms and methodologies in satellite calibration, developed a comprehensive algorithm and recalibrated the VIIRS radiometric data that have been recorded since launch. In the recalibration, we took into account all aspects of calibration that may affect the data quality, including inconsistencies in the processing algorithms, terrain correction, straylight correction and anomalies in the thermal bands (discussed in detail in Section2). To improve the stability of the reflective solar bands, we synthesized all calibration and validation methodologies and results, and developed a Kalman filtering model to incorporate onboard solar, lunar, desert site, inter- satellite calibration, and deep convective-cloud-based calibrations. We further developed and implemented the solar diffuser Surface Roughness Rayleigh Scattering (SRRS) model to account for the degradation in the near infrared bands, which the solar diffuser stability monitor does not cover. The recalibrated dataset was validated using vicarious sites and Remote Sens. 2021, 13, 1075 3 of 35 alternative methods, and compared with independent processing from other organizations. The recalibrated sensor data records or level 1b radiance data incorporate
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